Design and optimization of dual electron multileaf collimator

Inyang, SO; Chamberlain, A.C.

doi:10.1016/j.ejmp.2015.07.103

Cited by 1 publication

(6 citation statements)

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“…To develop numerical models of plastics "weighted" with metal impurities, both mass-produced materials were studied, for example, BFCopper (Bestfilament) [10] -metal-filled plastic based on PLA with an admixture of copper, and specially manufactured filaments (plastic thread of a given diameter), density which may vary depending on the amount of copper impurity in the plastic base. Natural PLA plastic was chosen as the base material; the filament density of this plastic was determined by the mass method and amounted to 1.36 g/cm 3 . The mass concentration of the metal, depending on the desired density of the "weighted" polymer material, can be determined according to the expression:…”

Section: Samples From Modified Plasticsmentioning

confidence: 99%

“…where 𝜌 PLA -PLA plastic density; 𝜌 Cu -copper density; 𝜌 -"weighted" polymer material density. Thus, filaments were custom made from a "weighted" polymer material with densities of 1.40 g/cm 3 , 1.44 g/cm 3 and 1.54 g/cm 3 , which corresponds to copper mass concentrations of 3.5%, 6.5% and 14%. Additionally, the BFCopper filament density was determined to be 1.57 g/cm 3 , which corresponds to a copper mass concentration of 16%.…”

Section: Samples From Modified Plasticsmentioning

confidence: 99%

“…Thus, filaments were custom made from a "weighted" polymer material with densities of 1.40 g/cm 3 , 1.44 g/cm 3 and 1.54 g/cm 3 , which corresponds to copper mass concentrations of 3.5%, 6.5% and 14%. Additionally, the BFCopper filament density was determined to be 1.57 g/cm 3 , which corresponds to a copper mass concentration of 16%. The densities of filaments from the studied materials were determined by the mass method.…”

Section: Samples From Modified Plasticsmentioning

confidence: 99%

“…This treatment method is called electron beam therapy, which can be implemented as classical external irradiation, or intraoperative, which is carried out directly during the surgical procedure [2]. Of particular importance in relation to electron beam therapy are devices such as boluses, compensators and collimators that form an irradiation field of complex shape [3,4]. Boluses and compensators make it possible to shift the dose load distribution to different depths, and collimators, in turn, set the shape of the irradiation field [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Of particular importance in relation to electron beam therapy are devices such as boluses, compensators and collimators that form an irradiation field of complex shape [3,4]. Boluses and compensators make it possible to shift the dose load distribution to different depths, and collimators, in turn, set the shape of the irradiation field [3,4]. Standard methods for manufacturing collimators and compensators are cutting or melting metals.…”

Section: Introductionmentioning

confidence: 99%

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Compressing of experimental and simulated results of electron beam interaction with FFF-printed samples

Bushmina,

Bulavskaya,

Grigorieva

et al. 2024

J. Inst.

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One of the important parameters characterizing the interaction of electron beams with matter is the depth dose distribution. To develop a new approach for shaping electron beams using specially created materials suitable for the manufacture of complex 3D-printed devices, it is necessary to analyze the features of ionizing radiation propagation. In this work, numerical simulations and experimental studies of the interaction between electron beams and plastic materials weighted with metallic impurities of different concentrations, suitable for fabricating samples using the rapid prototyping method, were carried out. Sets of plates made from the investigated plastics were created using the fused filament fabrication (FFF) technique. Since the FFF sample fabrication process involves forming objects from a thermoplastic mass through layer-by-layer alignment, a distinctive feature of the printed samples is their lower actual density compared to the density of the material (filament) from which they are made. Taking this fact into account, the actual density of the polymer plates was calculated. Based on this data, numerical models of the plastic materials weighted with metallic impurities were developed, and virtual models of the experimental setup were created to calculate the electron beam depth dose distributions in the materials. In the next step of the investigation, experimental studies were performed using electron beams with energies of 6 and 10 MeV. Pre-calibrated GafChromic EBT3 dosimetry films were used as detectors to obtain the experimental data on the electron beam depth dose distributions in the materials under consideration. It was observed that with an increasing concentration of metal impurities in the plastic base, the depth dose distribution moves into smaller thicknesses. It was observed that the simulation and experimental results are in good agreement.

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Section: Samples From Modified Plasticsmentioning

confidence: 99%

Section: Samples From Modified Plasticsmentioning

confidence: 99%